You can but it's a bit more involved than it appears at first blush:
1. On new SQL server, in SQL Mgmt Studio, manually create the MAS_User and MAS_Reports SQL login accounts.
2. Backup the MAS_XXX and MAS_SYSTEM databases from old SQL Server and restore to new. Or detach / attach.
3. Set the database permissions for MAS_User and MAS_System. Somewhere on SocialCast I posted a SQL script to @JimWoodhead on how to do that once.
4. Run the Sage SQL Settings Utility from Start / All Programs / Sage. Change the Database Server field to the new SQL Server. Also put in the same passwords for Mas_user and Mas_Reports you did in Step 1. Make sure Test Connection button works. The point of this whole step is to update the MASSQL.Settings file in \mas90\home on App Server